Power Level Selection; Safety Features - SKF TIH 220m Instrucciones De Uso

5.8 Power level selection

When heating bearings with an induction heater, most of the heat will be generated in the
inner bearing race. The heat will then be transferred through the bearing. It is therefore
important that bearings with reduced internal clearance are heated slowly. Slow heating
ensures that the bearing expands evenly, thereby preventing damage to the bearing.
The shape, weight, size, and internal clearances all affect the amount of time required to
heat a bearing. The large variety of bearing types precludes the possibility of providing a
speciic power level setting for each type.
Instead, the following guidelines are provided:
• For sensitive bearings (including bearings with C1 or C2 internal clearance) or
bearings with brass cages, do not exceed 50% power.
• When using the small yoke, never exceed 50% power.
For SRB or CARB bearings, special care must be taken when heating in a horizontal
®
position and subsequent mounting, especially on vertical shafts. The weight of the rollers
will always set themselves in the lowest position possible: they will be in contact with both
raceways, giving a reduction in the internal clearance. For heavy SRB or CARB
with heavy rollers we strongly recommend the use of roller centering ring.
The roller centering ring keeps the rollers in position in the middle of the raceways during
the heating process and the mounting.

6. Safety features

The TIH 220m is equipped with the following safety features:
• Automatic overheating protection
• Automatic current control
• Over-current circuit breaker.
• In the TEMP MODE the heater will switch off if the temperature probe does not
register a temperature increase of 1°C (1.8°F) every 15 seconds (0,25 minute).
To increase the interval to 30 seconds (0,50 minute), press MODE and DOWN
at the same time.
12
bearings
®
SKF TIH 220m